How to say in Czech: Their Bulgarian is very good.

English
is very good.
Czech
Jejich bulharština je velmi dobrá.
I do not speak Bulgarian very well.
You speak Bulgarian very well.
How good is their Bulgarian?
Their Bulgarian is getting better.
Their native language is Bulgarian.
Are they learning Bulgarian on their own?
Bulgarian is a difficult language.
Bulgarian is difficult.
He is Bulgarian.
He is learning Bulgarian.

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